Packaging laminate for bags
Inactive Publication Date: 2002-09-12
PATOURAUX ANDRE +1
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
[0016] In another aspect, the laminate is made partly by extrusion and partly by glue lamination to improve price while holding high performance characteristics.
Problems solved by technology
This implies that the layers of the laminate should be flat because the quantity of glue should be small, otherwise the laminate becomes stiff and difficult to handle.
This system suffers from various problems both from a technical point of view and in the method being used to protect items.
First, the prior art cover laminates are not strong enough.
During the manufacture of the covers, they are frequently torn out by sharp edged items and have to be replaced.
Most items to be packaged have irregular shapes and this problem may occur a number of times. Even after arrival at the destination, a simple sharp edge may compromise the cover, making the content of the cover unusable.
But even with such a reinforcement material, problems usually occur.
The material exhausts the moisture inside the cover, which may lead to corrosion of the items packaged.
Thus, users of such packages are faced with high production costs due to the replacement of covers, the reinforcement material being used, the labor costs involved and further problems when items arrive at a destination and are stored for a period of time.
Moreover, it is not 100% sure that the items packaged will be well protected during the transportation.
Secondly, the prior art cover materials have a board-like metallic aspect and are quite hard to handle and conveniently fold.
Consequently, during their manipulation, various weakening points appear mainly at the folded parts of the cover and the aluminum foil is partially destroyed, making a pinhole cloud noticeable by transparency.
These defects are not 100% visible to the workers because they are not supposed to check the products, but to weld them.
Thirdly, the prior art cover materials are made by lamination with glue applied at a low temperature.
), the chemical structure of the glue is altered and the welded seals are partly destroyed.
They are so weak that even the producers draw customers' attention on them in their specification sheets.
Fourthly, the prior art cover materials have a small heat conductivity because heat applied by a welding grip is not easily transferred.
Only the aluminum foil has a high heat conductivity and heat has to be applied longer with a high pressure, which also leads to a destruction of the glue and to poor seals.
Fifthly, prior art cover materials have no good water vapor transmission rate.
The aluminum foil is quite thin and can be partially destroyed during the manufacture of the cover.
Moreover the glue is quite hard and when the product is folded glue particles may be pushed into the foil and damage it severely.
Consequently, the prior art cover materials are not 100% reliable for their water vapor transmission rate which is quite high even if it is within the requirements of the American standard specifications.
Sixthly, due to the various above-mentioned problems, the process used to protect goods by quick exhaustion of the inner atmosphere by a vacuum pump is poor, because the covers are not 100% gas-proof and after a certain time moisture-loaded air substantially enters the covers and the drying agent is soon saturated.
Others have tried to inject nitrogen into the covers to dry the items inside, but the problems remain and various customers have experienced substantial damage even if everything seemed to be correct when their goods were packed.
In summary, prior art cover materials are quite poor in their characteristics and even dangerous for the valuable goods they are supposed to protect.
Moreover, even if their price is quite low, they incur substantial additional costs due to all the problems arising during their manufacture and later on upon their transportation and storage.
Added insurance costs are also a consequence.
Method used
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Examples
Experimental program
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Effect test
example 1
[0055] A first example of a laminate is MILPAC 113, shown in a separated view in FIG. 1. The MILPAC 113 laminate 10 is made up of the following layers:
[0056] 17 g / sqm metallized polyester 12
[0057] 20 g / sqm LDPE 14
[0058] 54 g / sqm aluminum foil 16
[0059] 40 g / sqm LDPE 18
[0060] 150 g / sqm crossed film 20
example 2
[0061] A second example of a laminate is MILPAC 113 Plus, shown in a separated view in FIG. 2. The MILPAC 113 Plus laminate 30 is made up as follows:
[0062] 17 g / sqm metallized polyester 32
[0063] 20 g / sqm LDPE 34
[0064] 70 g / sqm first crossed film 36
[0065] 20 g / sqm LDPE 38
[0066] 54 g / sqm aluminum foil 40
[0067] 40 g / sqm LDPE 42
[0068] 90 g / sqm crossed film 44
example 3
[0069] MILPAC 143: a laminate made up as follows:
[0070] 17 g / sqm metallized polyester 32
[0071] 20 g / sqm LDPE
[0072] 26 g / sqm aluminum foil
[0073] 40 g / sqm LDPE
[0074] 70 g / sqm crossed film
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Abstract
The present invention relates to improved cover laminates with high performance for forming covers for industrial packaging. The laminates include substantially one layer of metallized polyester, and one or two layers of a special polyethylene layer supplied as a crossed film. The laminate may be made by an extrusion process carried out at 300.degree. C. , by glue lamination, or a combination of the two.
Description
[0001] This is a continuation-in-part application of application Ser. No. 08 / 648,086, filed May 28, 1996.FIELD OF THE INVENTION[0002] The present invention relates to packaging laminates for bags, more particularly for industrial covers.BACKGROUND OF THE INVENTION[0003] In industrial packaging, various packaging laminates are conventionally formed by gluing an aluminum foil on one side to a polyester layer and on the other side to a plastic film such as polyethylene, in order to protect items packaged in the cover from moisture and contaminants. This implies that the layers of the laminate should be flat because the quantity of glue should be small, otherwise the laminate becomes stiff and difficult to handle. The cover is generally treated with a vacuum pump which puts the items inside the cover under a partial vacuum. A quantity of drying agent, such as silica gel, the amount of which is calculated according to the volume of the bag and the country of destination (due to weather c...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B32B15/08B32B27/32B32B27/36B65B31/04B65D81/20F16K15/18
CPCB32B15/08B32B27/32B32B27/36B65B31/04B65D81/2084B65D2565/387F16K15/18Y10S428/91Y10T428/31681Y10T428/3192Y10T428/31797Y10T428/31913Y10T428/31692Y10T428/31786Y02W30/806Y10T428/24851Y10T428/273Y10T428/266Y10T428/27Y10T428/269Y10T428/1334Y10T428/24802Y02W30/80
InventorPATOURAUX, ANDREPATOURAUX, PHILIPPE
OwnerPATOURAUX ANDRE